Element - A substance made from only one type of atom, Mixture - A substance made when different substances are together but have NOT joined, Compound - Formed when different atoms join together, Nucleus - The centre of an atom where protons and neutrons are found, Electron - Negatively charged particle found in the shells of all atoms, Shells - Also called 'orbits', these are around the nucleus, Proton - Positively charged particle found in the nucleus of all atoms, Neutron - Neutral particle found in the nucleus of atoms, Two - Maximum number of electrons that the first shell can hold, Eight - Maximum number of electrons that the second and third shells can hold, Isotopes - Atoms of the same element which have different numbers of neutrons, Positive ion - This forms when an atom loses electrons, Negative ion - This forms when an atom gains electrons, Mass number - atomic number - This is how you work out the number of neutrons in an atom's nucleus, Atomic number - This tells us how many protons / electrons are in an atom,

Atoms and elements

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